# -*- coding: utf-8 -*-
"""
# @Time    : 2021/1/12 下午4:42
# @Author  : tgy

            object
            |
            D
           /  \
          C1  C2
         /    / \
        B1   B2  B3
        \    /   /
            A



"""

class D:
    ...

class C1(D):
    ...

class C2(D):
    ...


class B1(C1):
    ...

class B2(C2):
    ...

class B3(C2):
    ...


class A(B2, B3, B1):
    ...




if __name__ == '__main__':
    ...
    print(A.mro())